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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: SQLKVTransaction.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.sql;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.Closeable;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.sql.Connection;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.sql.PreparedStatement;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.sql.ResultSet;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.sql.SQLException;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.HashMap;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.Iterator;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.NoSuchElementException;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.kv.AbstractKVStore;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.jsimpledb.kv.KVPair;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.jsimpledb.kv.KVTransaction;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.jsimpledb.kv.KVTransactionException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.jsimpledb.kv.StaleTransactionException;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.slf4j.Logger;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.slf4j.LoggerFactory;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * {@link SQLKVDatabase} transaction.<a name="line.28"></a>
<span class="sourceLineNo">029</span> */<a name="line.29"></a>
<span class="sourceLineNo">030</span>public class SQLKVTransaction extends AbstractKVStore implements KVTransaction {<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>    protected final Logger log = LoggerFactory.getLogger(this.getClass());<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>    protected final SQLKVDatabase database;<a name="line.34"></a>
<span class="sourceLineNo">035</span>    protected final Connection connection;<a name="line.35"></a>
<span class="sourceLineNo">036</span>    protected final HashMap&lt;StmtType, PreparedStatement&gt; preparedStatements = new HashMap&lt;StmtType, PreparedStatement&gt;();<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    private long timeout;<a name="line.38"></a>
<span class="sourceLineNo">039</span>    private boolean closed;<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private boolean stale;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    /**<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * Constructor.<a name="line.43"></a>
<span class="sourceLineNo">044</span>     *<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @param database the associated database<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * @param connection the {@link Connection} for the transaction<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * @throws SQLException if an SQL error occurs<a name="line.47"></a>
<span class="sourceLineNo">048</span>     */<a name="line.48"></a>
<span class="sourceLineNo">049</span>    public SQLKVTransaction(SQLKVDatabase database, Connection connection) throws SQLException {<a name="line.49"></a>
<span class="sourceLineNo">050</span>        if (database == null)<a name="line.50"></a>
<span class="sourceLineNo">051</span>            throw new IllegalArgumentException("null database");<a name="line.51"></a>
<span class="sourceLineNo">052</span>        if (connection == null)<a name="line.52"></a>
<span class="sourceLineNo">053</span>            throw new IllegalArgumentException("null connection");<a name="line.53"></a>
<span class="sourceLineNo">054</span>        this.database = database;<a name="line.54"></a>
<span class="sourceLineNo">055</span>        this.connection = connection;<a name="line.55"></a>
<span class="sourceLineNo">056</span>    }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>    @Override<a name="line.58"></a>
<span class="sourceLineNo">059</span>    public SQLKVDatabase getKVDatabase() {<a name="line.59"></a>
<span class="sourceLineNo">060</span>        return this.database;<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>    @Override<a name="line.63"></a>
<span class="sourceLineNo">064</span>    public void setTimeout(long timeout) {<a name="line.64"></a>
<span class="sourceLineNo">065</span>        if (timeout &lt; 0)<a name="line.65"></a>
<span class="sourceLineNo">066</span>            throw new IllegalArgumentException("negative timeout");<a name="line.66"></a>
<span class="sourceLineNo">067</span>        this.timeout = timeout;<a name="line.67"></a>
<span class="sourceLineNo">068</span>    }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>    @Override<a name="line.70"></a>
<span class="sourceLineNo">071</span>    public synchronized byte[] get(byte[] key) {<a name="line.71"></a>
<span class="sourceLineNo">072</span>        if (this.stale)<a name="line.72"></a>
<span class="sourceLineNo">073</span>            throw new StaleTransactionException(this);<a name="line.73"></a>
<span class="sourceLineNo">074</span>        if (key == null)<a name="line.74"></a>
<span class="sourceLineNo">075</span>            throw new IllegalArgumentException("null key");<a name="line.75"></a>
<span class="sourceLineNo">076</span>        return this.queryBytes(StmtType.GET, key);<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    @Override<a name="line.79"></a>
<span class="sourceLineNo">080</span>    public synchronized KVPair getAtLeast(byte[] minKey) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>        if (this.stale)<a name="line.81"></a>
<span class="sourceLineNo">082</span>            throw new StaleTransactionException(this);<a name="line.82"></a>
<span class="sourceLineNo">083</span>        return minKey != null ?<a name="line.83"></a>
<span class="sourceLineNo">084</span>          this.queryKVPair(StmtType.GET_AT_LEAST_SINGLE, minKey) : this.queryKVPair(StmtType.GET_FIRST);<a name="line.84"></a>
<span class="sourceLineNo">085</span>    }<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>    @Override<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public synchronized KVPair getAtMost(byte[] maxKey) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>        if (this.stale)<a name="line.89"></a>
<span class="sourceLineNo">090</span>            throw new StaleTransactionException(this);<a name="line.90"></a>
<span class="sourceLineNo">091</span>        return maxKey != null ?<a name="line.91"></a>
<span class="sourceLineNo">092</span>          this.queryKVPair(StmtType.GET_AT_MOST_SINGLE, maxKey) : this.queryKVPair(StmtType.GET_LAST);<a name="line.92"></a>
<span class="sourceLineNo">093</span>    }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>    @Override<a name="line.95"></a>
<span class="sourceLineNo">096</span>    public synchronized Iterator&lt;KVPair&gt; getRange(byte[] minKey, byte[] maxKey, boolean reverse) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        if (this.stale)<a name="line.97"></a>
<span class="sourceLineNo">098</span>            throw new StaleTransactionException(this);<a name="line.98"></a>
<span class="sourceLineNo">099</span>        if (minKey == null &amp;&amp; maxKey == null)<a name="line.99"></a>
<span class="sourceLineNo">100</span>            return this.queryIterator(reverse ? StmtType.GET_ALL_REVERSE : StmtType.GET_ALL_FORWARD);<a name="line.100"></a>
<span class="sourceLineNo">101</span>        if (minKey == null)<a name="line.101"></a>
<span class="sourceLineNo">102</span>            return this.queryIterator(reverse ? StmtType.GET_AT_MOST_REVERSE : StmtType.GET_AT_MOST_FORWARD, maxKey);<a name="line.102"></a>
<span class="sourceLineNo">103</span>        if (maxKey == null)<a name="line.103"></a>
<span class="sourceLineNo">104</span>            return this.queryIterator(reverse ? StmtType.GET_AT_LEAST_REVERSE : StmtType.GET_AT_LEAST_FORWARD, minKey);<a name="line.104"></a>
<span class="sourceLineNo">105</span>        else<a name="line.105"></a>
<span class="sourceLineNo">106</span>            return this.queryIterator(reverse ? StmtType.GET_RANGE_REVERSE : StmtType.GET_RANGE_FORWARD, minKey, maxKey);<a name="line.106"></a>
<span class="sourceLineNo">107</span>    }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    @Override<a name="line.109"></a>
<span class="sourceLineNo">110</span>    public synchronized void put(byte[] key, byte[] value) {<a name="line.110"></a>
<span class="sourceLineNo">111</span>        if (key == null)<a name="line.111"></a>
<span class="sourceLineNo">112</span>            throw new IllegalArgumentException("null key");<a name="line.112"></a>
<span class="sourceLineNo">113</span>        if (value == null)<a name="line.113"></a>
<span class="sourceLineNo">114</span>            throw new IllegalArgumentException("null value");<a name="line.114"></a>
<span class="sourceLineNo">115</span>        if (this.stale)<a name="line.115"></a>
<span class="sourceLineNo">116</span>            throw new StaleTransactionException(this);<a name="line.116"></a>
<span class="sourceLineNo">117</span>        this.update(StmtType.PUT, key, value, value);<a name="line.117"></a>
<span class="sourceLineNo">118</span>    }<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span>    @Override<a name="line.120"></a>
<span class="sourceLineNo">121</span>    public synchronized void remove(byte[] key) {<a name="line.121"></a>
<span class="sourceLineNo">122</span>        if (key == null)<a name="line.122"></a>
<span class="sourceLineNo">123</span>            throw new IllegalArgumentException("null key");<a name="line.123"></a>
<span class="sourceLineNo">124</span>        if (this.stale)<a name="line.124"></a>
<span class="sourceLineNo">125</span>            throw new StaleTransactionException(this);<a name="line.125"></a>
<span class="sourceLineNo">126</span>        this.update(StmtType.REMOVE, key);<a name="line.126"></a>
<span class="sourceLineNo">127</span>    }<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>    @Override<a name="line.129"></a>
<span class="sourceLineNo">130</span>    public synchronized void removeRange(byte[] minKey, byte[] maxKey) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>        if (this.stale)<a name="line.131"></a>
<span class="sourceLineNo">132</span>            throw new StaleTransactionException(this);<a name="line.132"></a>
<span class="sourceLineNo">133</span>        if (minKey == null &amp;&amp; maxKey == null)<a name="line.133"></a>
<span class="sourceLineNo">134</span>            this.update(StmtType.REMOVE_ALL);<a name="line.134"></a>
<span class="sourceLineNo">135</span>        else if (minKey == null)<a name="line.135"></a>
<span class="sourceLineNo">136</span>            this.update(StmtType.REMOVE_AT_MOST, maxKey);<a name="line.136"></a>
<span class="sourceLineNo">137</span>        else if (maxKey == null)<a name="line.137"></a>
<span class="sourceLineNo">138</span>            this.update(StmtType.REMOVE_AT_LEAST, minKey);<a name="line.138"></a>
<span class="sourceLineNo">139</span>        else<a name="line.139"></a>
<span class="sourceLineNo">140</span>            this.update(StmtType.REMOVE_RANGE, minKey, maxKey);<a name="line.140"></a>
<span class="sourceLineNo">141</span>    }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>    @Override<a name="line.143"></a>
<span class="sourceLineNo">144</span>    public synchronized void commit() {<a name="line.144"></a>
<span class="sourceLineNo">145</span>        if (this.stale)<a name="line.145"></a>
<span class="sourceLineNo">146</span>            throw new StaleTransactionException(this);<a name="line.146"></a>
<span class="sourceLineNo">147</span>        this.stale = true;<a name="line.147"></a>
<span class="sourceLineNo">148</span>        try {<a name="line.148"></a>
<span class="sourceLineNo">149</span>            this.connection.commit();<a name="line.149"></a>
<span class="sourceLineNo">150</span>        } catch (SQLException e) {<a name="line.150"></a>
<span class="sourceLineNo">151</span>            throw this.handleException(e);<a name="line.151"></a>
<span class="sourceLineNo">152</span>        } finally {<a name="line.152"></a>
<span class="sourceLineNo">153</span>            this.closeConnection();<a name="line.153"></a>
<span class="sourceLineNo">154</span>        }<a name="line.154"></a>
<span class="sourceLineNo">155</span>    }<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>    @Override<a name="line.157"></a>
<span class="sourceLineNo">158</span>    public synchronized void rollback() {<a name="line.158"></a>
<span class="sourceLineNo">159</span>        if (this.stale)<a name="line.159"></a>
<span class="sourceLineNo">160</span>            return;<a name="line.160"></a>
<span class="sourceLineNo">161</span>        this.stale = true;<a name="line.161"></a>
<span class="sourceLineNo">162</span>        try {<a name="line.162"></a>
<span class="sourceLineNo">163</span>            this.connection.rollback();<a name="line.163"></a>
<span class="sourceLineNo">164</span>        } catch (SQLException e) {<a name="line.164"></a>
<span class="sourceLineNo">165</span>            throw this.handleException(e);<a name="line.165"></a>
<span class="sourceLineNo">166</span>        } finally {<a name="line.166"></a>
<span class="sourceLineNo">167</span>            this.closeConnection();<a name="line.167"></a>
<span class="sourceLineNo">168</span>        }<a name="line.168"></a>
<span class="sourceLineNo">169</span>    }<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span>    /**<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * Handle an unexpected SQL exception.<a name="line.172"></a>
<span class="sourceLineNo">173</span>     *<a name="line.173"></a>
<span class="sourceLineNo">174</span>     * &lt;p&gt;<a name="line.174"></a>
<span class="sourceLineNo">175</span>     * The implementation in {@link SQLKVTransaction} rolls back the SQL transaction, closes the associated {@link Connection},<a name="line.175"></a>
<span class="sourceLineNo">176</span>     * and wraps the exception via {@link SQLKVDatabase#wrapException SQLKVDatabase.wrapException()}.<a name="line.176"></a>
<span class="sourceLineNo">177</span>     * &lt;/p&gt;<a name="line.177"></a>
<span class="sourceLineNo">178</span>     *<a name="line.178"></a>
<span class="sourceLineNo">179</span>     * @param e original exception<a name="line.179"></a>
<span class="sourceLineNo">180</span>     * @return key/value transaction exception<a name="line.180"></a>
<span class="sourceLineNo">181</span>     */<a name="line.181"></a>
<span class="sourceLineNo">182</span>    protected KVTransactionException handleException(SQLException e) {<a name="line.182"></a>
<span class="sourceLineNo">183</span>        this.stale = true;<a name="line.183"></a>
<span class="sourceLineNo">184</span>        try {<a name="line.184"></a>
<span class="sourceLineNo">185</span>            this.connection.rollback();<a name="line.185"></a>
<span class="sourceLineNo">186</span>        } catch (SQLException e2) {<a name="line.186"></a>
<span class="sourceLineNo">187</span>            // ignore<a name="line.187"></a>
<span class="sourceLineNo">188</span>        } finally {<a name="line.188"></a>
<span class="sourceLineNo">189</span>            this.closeConnection();<a name="line.189"></a>
<span class="sourceLineNo">190</span>        }<a name="line.190"></a>
<span class="sourceLineNo">191</span>        return this.database.wrapException(this, e);<a name="line.191"></a>
<span class="sourceLineNo">192</span>    }<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>    /**<a name="line.194"></a>
<span class="sourceLineNo">195</span>     * Close the {@link Connection} associated with this instance, if it's not already closed.<a name="line.195"></a>
<span class="sourceLineNo">196</span>     * This method is idempotent.<a name="line.196"></a>
<span class="sourceLineNo">197</span>     */<a name="line.197"></a>
<span class="sourceLineNo">198</span>    protected void closeConnection() {<a name="line.198"></a>
<span class="sourceLineNo">199</span>        if (this.closed)<a name="line.199"></a>
<span class="sourceLineNo">200</span>            return;<a name="line.200"></a>
<span class="sourceLineNo">201</span>        this.closed = true;<a name="line.201"></a>
<span class="sourceLineNo">202</span>        try {<a name="line.202"></a>
<span class="sourceLineNo">203</span>            this.connection.close();<a name="line.203"></a>
<span class="sourceLineNo">204</span>        } catch (SQLException e) {<a name="line.204"></a>
<span class="sourceLineNo">205</span>            // ignore<a name="line.205"></a>
<span class="sourceLineNo">206</span>        }<a name="line.206"></a>
<span class="sourceLineNo">207</span>    }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>    @Override<a name="line.209"></a>
<span class="sourceLineNo">210</span>    protected void finalize() throws Throwable {<a name="line.210"></a>
<span class="sourceLineNo">211</span>        try {<a name="line.211"></a>
<span class="sourceLineNo">212</span>            if (!this.stale)<a name="line.212"></a>
<span class="sourceLineNo">213</span>               this.log.warn(this + " leaked without commit() or rollback()");<a name="line.213"></a>
<span class="sourceLineNo">214</span>            this.closeConnection();<a name="line.214"></a>
<span class="sourceLineNo">215</span>        } finally {<a name="line.215"></a>
<span class="sourceLineNo">216</span>            super.finalize();<a name="line.216"></a>
<span class="sourceLineNo">217</span>        }<a name="line.217"></a>
<span class="sourceLineNo">218</span>    }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span>// Helper methods<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span>    private byte[] queryBytes(StmtType stmtType, byte[]... params) {<a name="line.222"></a>
<span class="sourceLineNo">223</span>        return this.query(stmtType, new ResultSetFunction&lt;byte[]&gt;() {<a name="line.223"></a>
<span class="sourceLineNo">224</span>            @Override<a name="line.224"></a>
<span class="sourceLineNo">225</span>            public byte[] apply(ResultSet resultSet) throws SQLException {<a name="line.225"></a>
<span class="sourceLineNo">226</span>                return resultSet.next() ? resultSet.getBytes(1) : null;<a name="line.226"></a>
<span class="sourceLineNo">227</span>            }<a name="line.227"></a>
<span class="sourceLineNo">228</span>        }, true, params);<a name="line.228"></a>
<span class="sourceLineNo">229</span>    }<a name="line.229"></a>
<span class="sourceLineNo">230</span><a name="line.230"></a>
<span class="sourceLineNo">231</span>    private KVPair queryKVPair(StmtType stmtType, byte[]... params) {<a name="line.231"></a>
<span class="sourceLineNo">232</span>        return this.query(stmtType, new ResultSetFunction&lt;KVPair&gt;() {<a name="line.232"></a>
<span class="sourceLineNo">233</span>            @Override<a name="line.233"></a>
<span class="sourceLineNo">234</span>            public KVPair apply(ResultSet resultSet) throws SQLException {<a name="line.234"></a>
<span class="sourceLineNo">235</span>                return resultSet.next() ? new KVPair(resultSet.getBytes(1), resultSet.getBytes(2)) : null;<a name="line.235"></a>
<span class="sourceLineNo">236</span>            }<a name="line.236"></a>
<span class="sourceLineNo">237</span>        }, true, params);<a name="line.237"></a>
<span class="sourceLineNo">238</span>    }<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span>    private Iterator&lt;KVPair&gt; queryIterator(StmtType stmtType, byte[]... params) {<a name="line.240"></a>
<span class="sourceLineNo">241</span>        return this.query(stmtType, new ResultSetFunction&lt;Iterator&lt;KVPair&gt;&gt;() {<a name="line.241"></a>
<span class="sourceLineNo">242</span>            @Override<a name="line.242"></a>
<span class="sourceLineNo">243</span>            public Iterator&lt;KVPair&gt; apply(ResultSet resultSet) throws SQLException {<a name="line.243"></a>
<span class="sourceLineNo">244</span>                return new ResultSetIterator(resultSet);<a name="line.244"></a>
<span class="sourceLineNo">245</span>            }<a name="line.245"></a>
<span class="sourceLineNo">246</span>        }, false, params);<a name="line.246"></a>
<span class="sourceLineNo">247</span>    }<a name="line.247"></a>
<span class="sourceLineNo">248</span><a name="line.248"></a>
<span class="sourceLineNo">249</span>    private &lt;T&gt; T query(StmtType stmtType, ResultSetFunction&lt;T&gt; resultSetFunction, boolean close, byte[]... params) {<a name="line.249"></a>
<span class="sourceLineNo">250</span>        try {<a name="line.250"></a>
<span class="sourceLineNo">251</span>            PreparedStatement preparedStatement = this.preparedStatements.get(stmtType);<a name="line.251"></a>
<span class="sourceLineNo">252</span>            if (preparedStatement == null) {<a name="line.252"></a>
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<span class="sourceLineNo">254</span>                this.preparedStatements.put(stmtType, preparedStatement);<a name="line.254"></a>
<span class="sourceLineNo">255</span>            }<a name="line.255"></a>
<span class="sourceLineNo">256</span>            for (int i = 0; i &lt; params.length; i++)<a name="line.256"></a>
<span class="sourceLineNo">257</span>                preparedStatement.setBytes(i + 1, params[i]);<a name="line.257"></a>
<span class="sourceLineNo">258</span>            preparedStatement.setQueryTimeout((int)((this.timeout + 999) / 1000));<a name="line.258"></a>
<span class="sourceLineNo">259</span>            if (this.log.isTraceEnabled())<a name="line.259"></a>
<span class="sourceLineNo">260</span>                this.log.trace("SQL query: " + preparedStatement);<a name="line.260"></a>
<span class="sourceLineNo">261</span>            final ResultSet resultSet = preparedStatement.executeQuery();<a name="line.261"></a>
<span class="sourceLineNo">262</span>            final T result = resultSetFunction.apply(resultSet);<a name="line.262"></a>
<span class="sourceLineNo">263</span>            if (close)<a name="line.263"></a>
<span class="sourceLineNo">264</span>                resultSet.close();<a name="line.264"></a>
<span class="sourceLineNo">265</span>            return result;<a name="line.265"></a>
<span class="sourceLineNo">266</span>        } catch (SQLException e) {<a name="line.266"></a>
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<span class="sourceLineNo">269</span>    }<a name="line.269"></a>
<span class="sourceLineNo">270</span><a name="line.270"></a>
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<span class="sourceLineNo">272</span>        try {<a name="line.272"></a>
<span class="sourceLineNo">273</span>            PreparedStatement preparedStatement = this.preparedStatements.get(stmtType);<a name="line.273"></a>
<span class="sourceLineNo">274</span>            if (preparedStatement == null) {<a name="line.274"></a>
<span class="sourceLineNo">275</span>                preparedStatement = stmtType.create(this.database, this.connection);<a name="line.275"></a>
<span class="sourceLineNo">276</span>                this.preparedStatements.put(stmtType, preparedStatement);<a name="line.276"></a>
<span class="sourceLineNo">277</span>            }<a name="line.277"></a>
<span class="sourceLineNo">278</span>            for (int i = 0; i &lt; params.length; i++)<a name="line.278"></a>
<span class="sourceLineNo">279</span>                preparedStatement.setBytes(i + 1, params[i]);<a name="line.279"></a>
<span class="sourceLineNo">280</span>            preparedStatement.setQueryTimeout((int)((this.timeout + 999) / 1000));<a name="line.280"></a>
<span class="sourceLineNo">281</span>            if (this.log.isTraceEnabled())<a name="line.281"></a>
<span class="sourceLineNo">282</span>                this.log.trace("SQL update: " + preparedStatement);<a name="line.282"></a>
<span class="sourceLineNo">283</span>            preparedStatement.executeUpdate();<a name="line.283"></a>
<span class="sourceLineNo">284</span>        } catch (SQLException e) {<a name="line.284"></a>
<span class="sourceLineNo">285</span>            throw this.handleException(e);<a name="line.285"></a>
<span class="sourceLineNo">286</span>        }<a name="line.286"></a>
<span class="sourceLineNo">287</span>    }<a name="line.287"></a>
<span class="sourceLineNo">288</span><a name="line.288"></a>
<span class="sourceLineNo">289</span>// ResultSetFunction<a name="line.289"></a>
<span class="sourceLineNo">290</span><a name="line.290"></a>
<span class="sourceLineNo">291</span>    private interface ResultSetFunction&lt;T&gt; {<a name="line.291"></a>
<span class="sourceLineNo">292</span><a name="line.292"></a>
<span class="sourceLineNo">293</span>        T apply(ResultSet resultSet) throws SQLException;<a name="line.293"></a>
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<span class="sourceLineNo">295</span><a name="line.295"></a>
<span class="sourceLineNo">296</span>// ResultSetIterator<a name="line.296"></a>
<span class="sourceLineNo">297</span><a name="line.297"></a>
<span class="sourceLineNo">298</span>    private class ResultSetIterator implements Iterator&lt;KVPair&gt;, Closeable {<a name="line.298"></a>
<span class="sourceLineNo">299</span><a name="line.299"></a>
<span class="sourceLineNo">300</span>        private ResultSet resultSet;<a name="line.300"></a>
<span class="sourceLineNo">301</span>        private boolean ready;<a name="line.301"></a>
<span class="sourceLineNo">302</span>        private byte[] removeKey;<a name="line.302"></a>
<span class="sourceLineNo">303</span><a name="line.303"></a>
<span class="sourceLineNo">304</span>        ResultSetIterator(ResultSet resultSet) {<a name="line.304"></a>
<span class="sourceLineNo">305</span>            if (resultSet == null)<a name="line.305"></a>
<span class="sourceLineNo">306</span>                throw new IllegalArgumentException("null database");<a name="line.306"></a>
<span class="sourceLineNo">307</span>            this.resultSet = resultSet;<a name="line.307"></a>
<span class="sourceLineNo">308</span>            synchronized (this) { }<a name="line.308"></a>
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<span class="sourceLineNo">310</span><a name="line.310"></a>
<span class="sourceLineNo">311</span>    // Iterator<a name="line.311"></a>
<span class="sourceLineNo">312</span><a name="line.312"></a>
<span class="sourceLineNo">313</span>        @Override<a name="line.313"></a>
<span class="sourceLineNo">314</span>        public synchronized boolean hasNext() {<a name="line.314"></a>
<span class="sourceLineNo">315</span>            if (this.resultSet == null)<a name="line.315"></a>
<span class="sourceLineNo">316</span>                return false;<a name="line.316"></a>
<span class="sourceLineNo">317</span>            if (this.ready)<a name="line.317"></a>
<span class="sourceLineNo">318</span>                return true;<a name="line.318"></a>
<span class="sourceLineNo">319</span>            try {<a name="line.319"></a>
<span class="sourceLineNo">320</span>                this.ready = this.resultSet.next();<a name="line.320"></a>
<span class="sourceLineNo">321</span>            } catch (SQLException e) {<a name="line.321"></a>
<span class="sourceLineNo">322</span>                throw SQLKVTransaction.this.handleException(e);<a name="line.322"></a>
<span class="sourceLineNo">323</span>            }<a name="line.323"></a>
<span class="sourceLineNo">324</span>            if (!this.ready)<a name="line.324"></a>
<span class="sourceLineNo">325</span>                this.close();<a name="line.325"></a>
<span class="sourceLineNo">326</span>            return this.ready;<a name="line.326"></a>
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<span class="sourceLineNo">328</span><a name="line.328"></a>
<span class="sourceLineNo">329</span>        @Override<a name="line.329"></a>
<span class="sourceLineNo">330</span>        public synchronized KVPair next() {<a name="line.330"></a>
<span class="sourceLineNo">331</span>            if (!this.hasNext())<a name="line.331"></a>
<span class="sourceLineNo">332</span>                throw new NoSuchElementException();<a name="line.332"></a>
<span class="sourceLineNo">333</span>            final byte[] key;<a name="line.333"></a>
<span class="sourceLineNo">334</span>            final byte[] value;<a name="line.334"></a>
<span class="sourceLineNo">335</span>            try {<a name="line.335"></a>
<span class="sourceLineNo">336</span>                key = this.resultSet.getBytes(1);<a name="line.336"></a>
<span class="sourceLineNo">337</span>                value = this.resultSet.getBytes(2);<a name="line.337"></a>
<span class="sourceLineNo">338</span>            } catch (SQLException e) {<a name="line.338"></a>
<span class="sourceLineNo">339</span>                throw SQLKVTransaction.this.handleException(e);<a name="line.339"></a>
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<span class="sourceLineNo">342</span>            this.ready = false;<a name="line.342"></a>
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<span class="sourceLineNo">345</span><a name="line.345"></a>
<span class="sourceLineNo">346</span>        @Override<a name="line.346"></a>
<span class="sourceLineNo">347</span>        public synchronized void remove() {<a name="line.347"></a>
<span class="sourceLineNo">348</span>            if (this.resultSet == null || this.removeKey == null)<a name="line.348"></a>
<span class="sourceLineNo">349</span>                throw new IllegalStateException();<a name="line.349"></a>
<span class="sourceLineNo">350</span>            SQLKVTransaction.this.remove(this.removeKey);<a name="line.350"></a>
<span class="sourceLineNo">351</span>            this.removeKey = null;<a name="line.351"></a>
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<span class="sourceLineNo">353</span><a name="line.353"></a>
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<span class="sourceLineNo">355</span><a name="line.355"></a>
<span class="sourceLineNo">356</span>        @Override<a name="line.356"></a>
<span class="sourceLineNo">357</span>        public synchronized void close() {<a name="line.357"></a>
<span class="sourceLineNo">358</span>            if (this.resultSet == null)<a name="line.358"></a>
<span class="sourceLineNo">359</span>                return;<a name="line.359"></a>
<span class="sourceLineNo">360</span>            try {<a name="line.360"></a>
<span class="sourceLineNo">361</span>                this.resultSet.close();<a name="line.361"></a>
<span class="sourceLineNo">362</span>            } catch (Exception e) {<a name="line.362"></a>
<span class="sourceLineNo">363</span>                // ignore<a name="line.363"></a>
<span class="sourceLineNo">364</span>            } finally {<a name="line.364"></a>
<span class="sourceLineNo">365</span>                this.resultSet = null;<a name="line.365"></a>
<span class="sourceLineNo">366</span>            }<a name="line.366"></a>
<span class="sourceLineNo">367</span>        }<a name="line.367"></a>
<span class="sourceLineNo">368</span><a name="line.368"></a>
<span class="sourceLineNo">369</span>    // Object<a name="line.369"></a>
<span class="sourceLineNo">370</span><a name="line.370"></a>
<span class="sourceLineNo">371</span>        @Override<a name="line.371"></a>
<span class="sourceLineNo">372</span>        protected void finalize() throws Throwable {<a name="line.372"></a>
<span class="sourceLineNo">373</span>            try {<a name="line.373"></a>
<span class="sourceLineNo">374</span>                this.close();<a name="line.374"></a>
<span class="sourceLineNo">375</span>            } finally {<a name="line.375"></a>
<span class="sourceLineNo">376</span>                super.finalize();<a name="line.376"></a>
<span class="sourceLineNo">377</span>            }<a name="line.377"></a>
<span class="sourceLineNo">378</span>        }<a name="line.378"></a>
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<span class="sourceLineNo">380</span><a name="line.380"></a>
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<span class="sourceLineNo">382</span><a name="line.382"></a>
<span class="sourceLineNo">383</span>    abstract static class StmtType {<a name="line.383"></a>
<span class="sourceLineNo">384</span><a name="line.384"></a>
<span class="sourceLineNo">385</span>        static final StmtType GET = new StmtType() {<a name="line.385"></a>
<span class="sourceLineNo">386</span>            @Override<a name="line.386"></a>
<span class="sourceLineNo">387</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.387"></a>
<span class="sourceLineNo">388</span>                return c.prepareStatement(db.createGetStatement());<a name="line.388"></a>
<span class="sourceLineNo">389</span>            };<a name="line.389"></a>
<span class="sourceLineNo">390</span>        };<a name="line.390"></a>
<span class="sourceLineNo">391</span>        static final StmtType GET_AT_LEAST_SINGLE = new StmtType() {<a name="line.391"></a>
<span class="sourceLineNo">392</span>            @Override<a name="line.392"></a>
<span class="sourceLineNo">393</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.393"></a>
<span class="sourceLineNo">394</span>                return c.prepareStatement(db.limitSingleRow(db.createGetAtLeastStatement(false)));<a name="line.394"></a>
<span class="sourceLineNo">395</span>            };<a name="line.395"></a>
<span class="sourceLineNo">396</span>        };<a name="line.396"></a>
<span class="sourceLineNo">397</span>        static final StmtType GET_AT_MOST_SINGLE = new StmtType() {<a name="line.397"></a>
<span class="sourceLineNo">398</span>            @Override<a name="line.398"></a>
<span class="sourceLineNo">399</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.399"></a>
<span class="sourceLineNo">400</span>                return c.prepareStatement(db.limitSingleRow(db.createGetAtMostStatement(false)));<a name="line.400"></a>
<span class="sourceLineNo">401</span>            };<a name="line.401"></a>
<span class="sourceLineNo">402</span>        };<a name="line.402"></a>
<span class="sourceLineNo">403</span>        static final StmtType GET_FIRST = new StmtType() {<a name="line.403"></a>
<span class="sourceLineNo">404</span>            @Override<a name="line.404"></a>
<span class="sourceLineNo">405</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.405"></a>
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<span class="sourceLineNo">407</span>            };<a name="line.407"></a>
<span class="sourceLineNo">408</span>        };<a name="line.408"></a>
<span class="sourceLineNo">409</span>        static final StmtType GET_LAST = new StmtType() {<a name="line.409"></a>
<span class="sourceLineNo">410</span>            @Override<a name="line.410"></a>
<span class="sourceLineNo">411</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.411"></a>
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<span class="sourceLineNo">413</span>            };<a name="line.413"></a>
<span class="sourceLineNo">414</span>        };<a name="line.414"></a>
<span class="sourceLineNo">415</span>        static final StmtType GET_AT_LEAST_FORWARD = new StmtType() {<a name="line.415"></a>
<span class="sourceLineNo">416</span>            @Override<a name="line.416"></a>
<span class="sourceLineNo">417</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.417"></a>
<span class="sourceLineNo">418</span>                return c.prepareStatement(db.createGetAtLeastStatement(false));<a name="line.418"></a>
<span class="sourceLineNo">419</span>            };<a name="line.419"></a>
<span class="sourceLineNo">420</span>        };<a name="line.420"></a>
<span class="sourceLineNo">421</span>        static final StmtType GET_AT_LEAST_REVERSE = new StmtType() {<a name="line.421"></a>
<span class="sourceLineNo">422</span>            @Override<a name="line.422"></a>
<span class="sourceLineNo">423</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.423"></a>
<span class="sourceLineNo">424</span>                return c.prepareStatement(db.createGetAtLeastStatement(true));<a name="line.424"></a>
<span class="sourceLineNo">425</span>            };<a name="line.425"></a>
<span class="sourceLineNo">426</span>        };<a name="line.426"></a>
<span class="sourceLineNo">427</span>        static final StmtType GET_AT_MOST_FORWARD = new StmtType() {<a name="line.427"></a>
<span class="sourceLineNo">428</span>            @Override<a name="line.428"></a>
<span class="sourceLineNo">429</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.429"></a>
<span class="sourceLineNo">430</span>                return c.prepareStatement(db.createGetAtMostStatement(false));<a name="line.430"></a>
<span class="sourceLineNo">431</span>            };<a name="line.431"></a>
<span class="sourceLineNo">432</span>        };<a name="line.432"></a>
<span class="sourceLineNo">433</span>        static final StmtType GET_AT_MOST_REVERSE = new StmtType() {<a name="line.433"></a>
<span class="sourceLineNo">434</span>            @Override<a name="line.434"></a>
<span class="sourceLineNo">435</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.435"></a>
<span class="sourceLineNo">436</span>                return c.prepareStatement(db.createGetAtMostStatement(true));<a name="line.436"></a>
<span class="sourceLineNo">437</span>            };<a name="line.437"></a>
<span class="sourceLineNo">438</span>        };<a name="line.438"></a>
<span class="sourceLineNo">439</span>        static final StmtType GET_RANGE_FORWARD = new StmtType() {<a name="line.439"></a>
<span class="sourceLineNo">440</span>            @Override<a name="line.440"></a>
<span class="sourceLineNo">441</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.441"></a>
<span class="sourceLineNo">442</span>                return c.prepareStatement(db.createGetRangeStatement(false));<a name="line.442"></a>
<span class="sourceLineNo">443</span>            };<a name="line.443"></a>
<span class="sourceLineNo">444</span>        };<a name="line.444"></a>
<span class="sourceLineNo">445</span>        static final StmtType GET_RANGE_REVERSE = new StmtType() {<a name="line.445"></a>
<span class="sourceLineNo">446</span>            @Override<a name="line.446"></a>
<span class="sourceLineNo">447</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.447"></a>
<span class="sourceLineNo">448</span>                return c.prepareStatement(db.createGetRangeStatement(true));<a name="line.448"></a>
<span class="sourceLineNo">449</span>            };<a name="line.449"></a>
<span class="sourceLineNo">450</span>        };<a name="line.450"></a>
<span class="sourceLineNo">451</span>        static final StmtType GET_ALL_FORWARD = new StmtType() {<a name="line.451"></a>
<span class="sourceLineNo">452</span>            @Override<a name="line.452"></a>
<span class="sourceLineNo">453</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.453"></a>
<span class="sourceLineNo">454</span>                return c.prepareStatement(db.createGetAllStatement(false));<a name="line.454"></a>
<span class="sourceLineNo">455</span>            };<a name="line.455"></a>
<span class="sourceLineNo">456</span>        };<a name="line.456"></a>
<span class="sourceLineNo">457</span>        static final StmtType GET_ALL_REVERSE = new StmtType() {<a name="line.457"></a>
<span class="sourceLineNo">458</span>            @Override<a name="line.458"></a>
<span class="sourceLineNo">459</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.459"></a>
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<span class="sourceLineNo">461</span>            };<a name="line.461"></a>
<span class="sourceLineNo">462</span>        };<a name="line.462"></a>
<span class="sourceLineNo">463</span>        static final StmtType PUT = new StmtType() {<a name="line.463"></a>
<span class="sourceLineNo">464</span>            @Override<a name="line.464"></a>
<span class="sourceLineNo">465</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.465"></a>
<span class="sourceLineNo">466</span>                return c.prepareStatement(db.createPutStatement());<a name="line.466"></a>
<span class="sourceLineNo">467</span>            };<a name="line.467"></a>
<span class="sourceLineNo">468</span>        };<a name="line.468"></a>
<span class="sourceLineNo">469</span>        static final StmtType REMOVE = new StmtType() {<a name="line.469"></a>
<span class="sourceLineNo">470</span>            @Override<a name="line.470"></a>
<span class="sourceLineNo">471</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.471"></a>
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<span class="sourceLineNo">473</span>            };<a name="line.473"></a>
<span class="sourceLineNo">474</span>        };<a name="line.474"></a>
<span class="sourceLineNo">475</span>        static final StmtType REMOVE_RANGE = new StmtType() {<a name="line.475"></a>
<span class="sourceLineNo">476</span>            @Override<a name="line.476"></a>
<span class="sourceLineNo">477</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.477"></a>
<span class="sourceLineNo">478</span>                return c.prepareStatement(db.createRemoveRangeStatement());<a name="line.478"></a>
<span class="sourceLineNo">479</span>            };<a name="line.479"></a>
<span class="sourceLineNo">480</span>        };<a name="line.480"></a>
<span class="sourceLineNo">481</span>        static final StmtType REMOVE_AT_LEAST = new StmtType() {<a name="line.481"></a>
<span class="sourceLineNo">482</span>            @Override<a name="line.482"></a>
<span class="sourceLineNo">483</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.483"></a>
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<span class="sourceLineNo">485</span>            };<a name="line.485"></a>
<span class="sourceLineNo">486</span>        };<a name="line.486"></a>
<span class="sourceLineNo">487</span>        static final StmtType REMOVE_AT_MOST = new StmtType() {<a name="line.487"></a>
<span class="sourceLineNo">488</span>            @Override<a name="line.488"></a>
<span class="sourceLineNo">489</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.489"></a>
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<span class="sourceLineNo">491</span>            };<a name="line.491"></a>
<span class="sourceLineNo">492</span>        };<a name="line.492"></a>
<span class="sourceLineNo">493</span>        static final StmtType REMOVE_ALL = new StmtType() {<a name="line.493"></a>
<span class="sourceLineNo">494</span>            @Override<a name="line.494"></a>
<span class="sourceLineNo">495</span>            PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException {<a name="line.495"></a>
<span class="sourceLineNo">496</span>                return c.prepareStatement(db.createRemoveAllStatement());<a name="line.496"></a>
<span class="sourceLineNo">497</span>            };<a name="line.497"></a>
<span class="sourceLineNo">498</span>        };<a name="line.498"></a>
<span class="sourceLineNo">499</span><a name="line.499"></a>
<span class="sourceLineNo">500</span>        abstract PreparedStatement create(SQLKVDatabase db, Connection c) throws SQLException;<a name="line.500"></a>
<span class="sourceLineNo">501</span>    }<a name="line.501"></a>
<span class="sourceLineNo">502</span>}<a name="line.502"></a>
<span class="sourceLineNo">503</span><a name="line.503"></a>




























































</pre>
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